I usually buy them at my local aquarium store but decided to get a set from Amazon. They work great and every Sunday I throw a ball in my aquarium. However, the problem here is that I order a set of 8 with each ball to process 30 gallons, so a total of 240 gallons to process. What I got was a set of 12 with each ball to handle 10 gallons for a total of 120 gallons. So that's half the cure. What surprised me the most was that the back of the product had a label with a barcode and a description that clearly said "8 packs (30 gallons)". Was it a legal error or plagiarism? Who knows just warns you when you order this.
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